Split prompt and profile load errors

engine_test.go

@@ -593,6 +593,59 @@ unknown_field: true
 	}
 }
 
+func TestPromptRepositoryReadFailureMapsToPromptLoad(t *testing.T) {
+	missingPromptDir := filepath.Join(t.TempDir(), "missing-prompts")
+	engine, err := scriptorium.NewEngine(scriptorium.Config{
+		PromptDir:  missingPromptDir,
+		ProfileDir: "./examples/profiles",
+		SchemaDir:  "./examples/schemas",
+	})
+	if err != nil {
+		t.Fatalf("expected engine construction to succeed, got %v", err)
+	}
+
+	_, err = engine.Prepare(context.Background(), scriptorium.RunRequest{
+		PromptID: "generic.markdown_summary",
+		Inputs: map[string]scriptorium.ArtifactRef{
+			"transcript": scriptorium.Inline("Rin opens the gate."),
+			"glossary":   scriptorium.Inline("gate: A guarded passage."),
+		},
+	})
+	if !errors.Is(err, scriptorium.ErrPromptLoad) {
+		t.Fatalf("expected ErrPromptLoad, got %v", err)
+	}
+	if errors.Is(err, scriptorium.ErrProfileLoad) {
+		t.Fatalf("did not expect ErrProfileLoad, got %v", err)
+	}
+}
+
+func TestSelectedProfileRepositoryReadFailureMapsToProfileLoad(t *testing.T) {
+	missingProfileDir := filepath.Join(t.TempDir(), "missing-profiles")
+	engine, err := scriptorium.NewEngine(scriptorium.Config{
+		PromptDir:  "./examples/prompts",
+		ProfileDir: missingProfileDir,
+		SchemaDir:  "./examples/schemas",
+	})
+	if err != nil {
+		t.Fatalf("expected engine construction to succeed, got %v", err)
+	}
+
+	_, err = engine.Prepare(context.Background(), scriptorium.RunRequest{
+		PromptID:  "generic.markdown_summary",
+		ProfileID: "local-fast",
+		Inputs: map[string]scriptorium.ArtifactRef{
+			"transcript": scriptorium.Inline("Rin opens the gate."),
+			"glossary":   scriptorium.Inline("gate: A guarded passage."),
+		},
+	})
+	if !errors.Is(err, scriptorium.ErrProfileLoad) {
+		t.Fatalf("expected ErrProfileLoad, got %v", err)
+	}
+	if errors.Is(err, scriptorium.ErrPromptLoad) {
+		t.Fatalf("did not expect ErrPromptLoad, got %v", err)
+	}
+}
+
 func TestPrepareUsesBuiltInProfileWithoutProfileDir(t *testing.T) {
 	t.Setenv("OPENROUTER_API_KEY", "test-key")
 	engine, err := scriptorium.NewEngine(scriptorium.Config{